1. Institute of Inorganic and Analytic Chemistry, Goethe-University, Max-von-Laue-Straße 7, 60438 Frankfurt/Main, Germany
2. Momentive Performance Materials, Chempark, 51368 Leverkusen, Germany
3. Momentive Performance Materials, 769 Old Saw Mill River Road, Tarrytown, New York 10591, United States